Superior Adsorption Properties of Dyeing Wastewater on PDMDAAC Modified Bentonite

2011 ◽  
Vol 356-360 ◽  
pp. 386-390
Author(s):  
Hong Shao ◽  
Ning Cao
Keyword(s):  
Industrial Wastewater ◽  
Treatment Process ◽  
Orthogonal Experiment ◽  
Adsorption Properties ◽  
Dyeing Wastewater ◽  
Reaction Conditions ◽  
Complex Composition ◽  
Modified Bentonite ◽  
Optimized Conditions ◽  
Decoloration Rate

With the development of printing and dyeing industry, the nation has become the world's largest dye production and use country. With the complex composition and high color, the dyeing wastewater was currently recognized as one of the more difficult industrial wastewater to deal with. The bentonites was modified by PDMDAAC and applied into the treatment of dyeing wastewater. The treatment process was optimized with the index of decoloration rate. The decoloration rate reached 99.76% under the optimized conditions of adsorbent dosage=2g/L, pH=11, adsorption time=80min, stirring speed=350r/min, solution concentrate=500mg/L. The orthogonal experiment was designed to investigate the interaction between various reaction conditions. The superiority of PDMDAAC modified bentonite was confirmed by the comparing experiment.

Preparation and Adsorption Properties of PDMDAAC Modified Bentonite

2011 ◽  
Vol 399-401 ◽  
pp. 1226-1229
Author(s):  
Hong Shao ◽  
Ning Cao ◽  
Da Wei Wang
Keyword(s):  
Adsorption Properties ◽  
Dyeing Wastewater ◽  
X Ray Diffraction ◽  
Modified Bentonite ◽  
Preparation Conditions ◽  
Treatment Agent ◽  
Optimized Conditions ◽  
Decoloration Rate ◽  
Interplanar Space

A novel environmentally friendly water treatment agent was prepared by the natural bentonite and PDMDAAC. The treatment effect of direct black G dyeing wastewater on different preparation conditions was studied. The decoloration rate reached 98.57% under the optimized conditions (cross-linker concentration of 40g/L, M-V of 12 g/L, contact time of 75min, particle size of 0.124mm). The performance characterization of the modified bentonite was observed by means of X-ray diffraction, scanning electron microscopy. The PDMDAAC has entered into the bentonite interplanar space. The adsorption properties of bentonite were improved, which was suitable for the treatment of dyeing wastewater.

Adsorption Properties of Dyeing Wastewater on 8-Hydroxyquinoline Modified Bentonite

2011 ◽  
Vol 71-78 ◽  
pp. 1118-1122
Author(s):  
Hong Shao ◽  
Ning Cao ◽  
Hong Kang Xiao
Keyword(s):  
Blue Dye ◽  
Dyeing Wastewater ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Modified Bentonite ◽  
X Ray ◽  
Direct Light ◽  
Effects Of Ph ◽  
Optimum Reaction ◽  
Decoloration Rate

A novel adsorption material was synthesized and characterized by the methods of X-ray diffraction and scanning electron microscopy. The optimum reaction conditions of the 8-hydroxyquinoline modified bentonites were studied. And the modified bentonite was applied into the treatment of dyeing wastewater. The decoloration rate was invested as index. The effects of pH, adsorbent dosage, stirring speed, sedimentation time on adsorption have also been studied. The result showed that the decoloration rate of direct light turquoise blue dye on modified bentonites reached 94.12%, and the decoloration rate of acid orange dyeing wastewater reached 74.46%. So this type of modified bentonite was suitable for the treatment of dyeing wastewater.

The Research on Preparation of Modified Bentonite and Adsorption of Crystal Violet in Dyeing Wastewater

2012 ◽  
Vol 610-613 ◽  
pp. 1731-1734
Author(s):  
Yu Chen ◽  
Shun Sheng Yang ◽  
Zheng Jun Gong ◽  
Dong Mei Wang
Keyword(s):  
Crystal Violet ◽  
Ph Value ◽  
Mixing Time ◽  
Dyeing Wastewater ◽  
Preparation Temperature ◽  
Modified Bentonite ◽  
Preparation Conditions ◽  
Dodecyltrimethylammonium Chloride ◽  
Decoloration Rate

Dodecyltrimethylammonium chloride was used to modify na-bentonite in Sichuan Yanting. It was studied that the optimal modification conditions of bentonite and its optimum decoloration conditions of crystal violet in dyeing wastewater. The optimum preparation conditions were that the concentration of dodecyltrimethylammonium chloride was 1000mg /L, the preparation temperature was 70°C and the mixing time was 20 minutes. The optimum adsorption conditions for crystal violet were that the pH value was 8, the mixing time was 20 minutes and the dosing quantity of modified bentonite was 15 g/L. The decoloration rate was 85.4% under aforesaid conditions.

Epoxidation of Soybean Oil under Acid-Free Condition

2014 ◽  
Vol 881-883 ◽  
pp. 140-143 ◽  
Author(s):  
Yong Xia Miao ◽  
Jian Ping Liu
Keyword(s):  
Double Bond ◽  
Soybean Oil ◽  
Orthogonal Experiment ◽  
Impregnation Method ◽  
Reaction Conditions ◽  
One Pot ◽  
Free System ◽  
Epoxy Ring Opening ◽  
Acidic Conditions ◽  
Optimized Conditions

Industrially the epoxidation of soybean oil utilize peracids as oxidizing agents together with strong mineral acids as catalyst. To avoid the corrosive waste and undesirable epoxy-ring opening as well as polymerization under acidic conditions, new green catalytic processes in acid-free system have been paid great attentions in recent years. In this paper, MoO3/Al2O3 simply prepared by impregnation method and mesoporous TS-1 prepared by one-pot hydrothermal method were evaluated as catalysts for the epoxidation of soybean oil with tert-butyl hydroperoxide. Orthogonal experiment design was used to optimize the reaction conditions for MoO3/Al2O3 and the optimized conditions are as reaction temperature of 80°C, reaction time of 4h, the ratio of double bond to TBHP of 1:1.4, and the ratio of Ti to double bond of 1%. Higher than 55.8% of selectivity would be obtained. The synthesized meso-TS-1 displayed worse performance than expected result, only 27.6% of epoxy selectivity at conversion of 38.7%.

scholarly journals Particle Size Distribution Based Occurrence Features of Organic Components in Printing and Dyeing Wastewater Under a Treatment Process

2019 ◽  
Vol 118 ◽  
pp. 04009
Author(s):  
Yuan Li ◽  
Jie Liu ◽  
Yibiao Yu ◽  
Hao Zhu ◽  
Zheng Shen ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Reverse Osmosis ◽  
Treatment Process ◽  
Dyeing Wastewater ◽  
Wastewater Treatment Process ◽  
Printing And Dyeing Wastewater ◽  
Sedimentation Tank ◽  
The Relationship

A more detailed occurrence features of organic matters in the printing and dyeing wastewater, based on its particle size distribution (PSD) and along with a wastewater treatment process, was conducted to provide a support for advanced treatment. Results suggested that, (1) In the dyeing wastewater, the occurrence characteristic of COD was: soluble>supra colloidal>colloidal>settleable; However, for protein, the supra colloidal was dominant, followed by the soluble. The feature of the polysaccharide was consistent with COD’s. In the wastewater, 29.66% of COD could be attributed to proteins and 3.45% of the COD could be attributed to polysaccharides. (2) The relationship among the forms of COD in the primary sedimentation tank, aerobic tank, secondary sedimentation tank, and reverse osmosis-treated concentrated effluent was consistent, that was: soluble>colloidal>supra colloidal>settleable. (3) In the primary sedimentation tank, the settleable COD was almost completely removed; In the aerobic tank, the residual super colloidal COD was not much; After MBR-RO treatment, the COD in the reverse osmosis concentrated water was almost dissolved and only a little presented in other forms.

Study on Pretreatment of Dye Wastewater by Fenton Oxidation Process

2012 ◽  
Vol 627 ◽  
pp. 378-381
Author(s):  
Bi Rong Wang
Keyword(s):  
Reaction Time ◽  
Oxidation Process ◽  
Removal Rate ◽  
Fenton Oxidation ◽  
Dye Wastewater ◽  
Dyeing Wastewater ◽  
Reaction Conditions ◽  
Fenton Oxidation Process

Fenton pretreatment has been used for treating dye wastewater. The effects of the dos of H2O2 and FeSO4, reaction time and pH on the removal COD were investigated. It was found that, when the reaction conditions are as follows: COD 2850 mg/L dyeing wastewater, the dosage of H2O2 is 140mmol/L, FeSO4 17.02 mmol/L, pH 7.6, and reaction time 1.0 h, the CODcr of dye wastewater removal rate of up to 70%. Fenton pretreatment process of dye wastewater has a broad prospect.

scholarly journals UV-Accelerated Photocatalytic Degradation of Pesticide over Magnetite and Cobalt Ferrite Decorated Graphene Oxide Composite

Plants ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 6
Author(s):  
Asma Tabasum ◽  
Mousa Alghuthaymi ◽  
Umair Yaqub Qazi ◽  
Imran Shahid ◽  
Qamar Abbas ◽  
...  
Keyword(s):  
Spectroscopic Techniques ◽  
Combined Effects ◽  
X Ray Diffraction ◽  
Contributing Factors ◽  
Reaction Conditions ◽  
X Ray ◽  
Oxidant Concentration ◽  
Optimized Conditions ◽  
High Degradation Rate ◽  
Considerable Loss

Pesticides are one of the main organic pollutants as they are highly toxic and extensively used worldwide. The reclamation of wastewater containing pesticides is of utmost importance. For this purpose, GO-doped metal ferrites (GO-Fe3O4 and GO-CoFe2O4) were prepared and characterized using scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopic techniques. Photocatalytic potentials of catalysts were investigated against acetamiprid’s degradation. A detailed review of the parametric study revealed that efficiency of overall Fenton’s process relies on the combined effects of contributing factors, i.e., pH, initial oxidant concentration, catalyst dose, contact time, and acetamiprid load. ~97 and ~90% degradation of the acetamiprid was achieved by GO-CoFe2O4 and GO-Fe3O4, respectively during the first hour under UV radiations at optimized reaction conditions. At optimized conditions (i.e., pH:3, [H2O2]: 14.5 mM (for Fe3O4, GO-Fe3O4, and GO-CoFe2O4) and 21.75 mM (for CoFe2O4), catalysts: 100 mgL−1, time: 60min) the catalysts exhibited excellent performance, with high degradation rate, magnetic power, easy recovery at the end, and efficient reusability (up to 5 cycles without any considerable loss in catalytic activity). A high magnetic character offers its easy separation from aqueous systems using an external magnet. Moreover, the combined effects of experimental variables were assessed simultaneously and justified using response surface methodology (RSM).

Alkaline Activated Material as the Adsorbent for Uptake of High Concentration of Zinc from Wastewater

2016 ◽  
Vol 721 ◽  
pp. 123-127 ◽  
Author(s):  
Kamila Gruskevica ◽  
Girts Bumanis ◽  
Kristina Tihomirova ◽  
Diana Bajare ◽  
Tālis Juhna
Keyword(s):  
Industrial Waste ◽  
Industrial Wastewater ◽  
Cementitious Material ◽  
Organic Substances ◽  
New Materials ◽  
Binding Agent ◽  
High Concentration ◽  
Complex Composition ◽  
Standard Solution ◽  
Post Industrial

The use of wastes for developing of new materials is a sustainable approach. In current study filter media produced from industrial waste was tested for an ability to decrease high concentration of zinc in standard solution and industrial wastewater. The geopolymer production requires mixing of post-industrial waste with naturally occurred aluminosilicate materials by using binding agent at the ambient or slightly increased temperature in order to produce a long lasting eco-friendly cementitious material. The tested media decreased concentration of zinc in standard solution from 72,9 to 19,6 mg/L in 30 min showing similar performance as commercially available zeolite material. In experiments with wastewater the adsorption of Zn by AAM was much lower, which can be explained by the fact that wastewater contained generous amounts of different metal ions, organic substances and oils. Despite complex composition of wastewater AAM was able to immobilize at minimum 22 mg/L (32%) Zn from the solution.

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